Machine for manufacturing valve bags



1954 P. c. ROBINSON 2,668,481

MACHINE FOR MANUFACTURING VALVE BAGS Filed Oct. 29, 1948 4 Sheets-Sheetl INVENTOR @111. 6'- POEM saw ATTORNEYS Feb. 9, 1954 P. c. ROBINSONMACHINE FOR MANUFACTURING VALVE BAGS Filed Oct. 29, 1948 4 Sheets-Sheet2 vx xxx MK I N V E N TO R P404 6! Foe/WM Feb. 9, 1954 P. c. ROBINSON2,668,481

MACHINE FOR MANUFACTURING VALVE BAGS Filed Oct. 29, 1948 '4 Sheets-Sheets TIHJU.

y /K/ Q; [I ll INVENTOR P904 6'. Pas/Also BY [fiu mm A TTORNEYS Feb.9,1954 P. c. ROBINSON MACHINE FOR MANUFACTURING VAL .VE BAGS 4Sheets-Sheet 4 Filed Oct. 29, 1948 INVENTOR P404 dfiaa/A/sa/v PatentedFeb. 9, 1954 Z 668A8l UNITED STATES PATENT OFFICE Paul0..Robinsom-canajoharie, N. Y., assignor .to

Arkell and Smiths, Canajoharie, N.. Y a corporation of New YorkAp-plicatiomctober 29, 1948;: Serial-No; 57,1 88" 4. Claims. l

Thepresent invention relates to-the manufacture of paper bags, and hasspecial reference to machines for manufacturing multi-ply valve bagsofthe type in;which a filling sleeveextends through the valve-opening.

One of the objects of the inventionais to provide a novel and improvedmachine of thischaracter- Another object of the invention. is-to'provide a machine whichis simple in construction and eflicient inoperation for forming the valve in the endof a bag; tube and applying a:supplemental. sheetor patch. to the. valve to form a filling sleeve.

The several features of theinvention, whereby these and other objectsmay be. attained; will be readilyunderstood from...the following.description. and accompanying drawings,- in which:

Figure 1. is. a view in perspective of a. gusseted bag, tube having avalve extension that is partic.- ularly; adapted to be operated upon bymy improved machine and in accordance. with my im. proved method to forma sleeve valve in one end thereof;

Figs. 2'through '7 are views. in perspective of the upper endportion ofthe bag tube respectively illustrating. di'fierent steps in carryingoutmy improved .method;

Fig. Siis a plan view, partly. diagrammatical, andwith parts brokenaway, of'a machineiembodying features otmy invention in theirprefe'rredformthe machine beingshown successivelyoperating. onaplurality of bagtubes;

Fig. 9 is a side view partly in section of the same; Y

Fig.1 10 is a plan view, on-an enlarged scale',. of the rear end portionof the machine illustrated in Fig. 8';

Fig. 11 is a detail view, on an enlarged scale, of a portion .of themachine illustrated. in' Fig. 10;

Fig. 12 is a sectional side View, taken substantially on the linel2"-l2'of'Fig. 11;

Fig-13is a view'in perspective: of a portion of a'bag tube and certainforming devices therefor illustrating one step in the manufacture of thecompleted bag;

Fig; 14'is a side view ofthe p'ortionofthe machine illustrated in Fig.10;

Fig; 15 is a detail plan view; on an enlarged scaleof' a portion'of themachine illustrated in Fig. 10; Fig. 16 is a side view partly insectionof the same; and

' Fig. 17 is a view-corresponding to a portion of Fig. 15 butwithparts-in a different position.

The machine as illustrated in'the drawings,

2. is particularly, adaptedfor use informing. a sleeve valve in amulti-ply bagtube 2. (Fig. 1) having gusseted sides 4 and a valveextension 5.

Ila accordance with my improved method as preferablycarried out, the endof the bag. tube having the-extension 6 is spread and flattened so as toprovide side flaps 8 and end flaps Hi and I2 overlying. theside flaps,the inner side flap. 8 being .foldednback. against the side wall of thebag tube. Such spreading of. the. end ofthe valve tube-maybeaccomplished either by hand or by machine. Any suitable. machine ormechanism may be employed .for thus spreading and flattening the. ends.of. the bag. tuba. such for example as the spreading. and flatteningmechanism illustratedand described. in the patent'to Potdevin 1,176,163,dated .March 21, 1916.. To assist inv the easy spreading. and flatteningof theendof thebag. tube,v the tube may be provided with suitablyarranged score lines It and 16.. where. the folds are made. Also theinner end of; the. valve extension maybe scoredon the line. l8-tovpermit. it to be easily folded back for the purpose hereinafterdescribed.

After thus. spreadingand flattening the end ofthe bag. tube, the valve.extension .6 is folded back. upon. the underlying end flap 12.. A sleevepatch 2001 the usual form is then appliedto the folded. valve extension6 by adhesively securing the inner end thereofto the upwardly. directedside. of the extension (Fig. 4), the patch being scored on the line 20..The valve extension 6 is-then returned to its unfolded position (Fig. 5)and thepatch 20 is foldedback over the edge of the extension and overthe end flap l2 with its outer or free end projecting beyond said endflap.

After'thus applying the sleeve patch the inner'side flap 8 is then swungtoward the other side flap to recl'ose the end of the bag tube (Fig.'7). During such movement of thisside flap, theva'lve extension 6' andend. flap [2 are centrallyfolded-i' between the=-side flaps, and thesleeve patch 20 is folded on the line 22 between the sides of said endflap, thus positioning the longitudinal edges of the patch substantiallyflush with the end edges of the bag tube when closed. Also, during suchclosing movement of the inner side flap, 8,. the other end flap I0 isrestored. to its initial position forming continuations of theadjacent'gusset and side walls of the bag tube.

In the machine illustrated in the drawing, the bag tubes" are suppliedto-the machine-with their upper ends insprea'd and flattened conditionas-illustrated' in 2 The bagtubes: are'conveyed through the machine byany suitable devices as by means of a chain conveyor 24 having suitablegripping devices 28 which engage the upper or advancing end of one wallof each bag tube at spaced points (Figs. 8, 9 and 10).

As the tubes are thus conveyed, a suitable folder 28 is engaged by thevalve extension 8 so as to cause the extension to be folded back uponthe end flap I2. During the continued travel of each bag tube, the innerend of a sleeve patch 20 is applied to the upwardly directed side of thefolded valve extension by means of rollers 38 between which the bag tubepasses, the end of the patch previously having adhesive applied theretoso as to cause said end to adhere to the valve extension. The sleevepatches 20 may be successively cut from a strip 32 which is suppliedfrom a roll 34. This strip passes down over idlers 36 and 38 betweenscore rolls 48 which score the strip to form the score line 28' on thecompleted sleeve patch, and then passes between draw rolls 42, betweencutting-off knives 44 and between draw rolls 46 which deliver each patchto a suitable gripping device 48 carried by the upper drum or roll 88.As each sleeve patch is cut off by the knives 4 5, rotating segments 58engage the patch and feed it between the rolls 46. After each patch isgripped by the grippers '38, it is carried by the upper roll 30 topresent the inner margin thereof to the valve extension, an adhesive pad52 previously applying adhesive to the inner margin of the patch. Thepad 52 is carried by a roll 54 and receives the adhesive from a roll 56that extends into a paste or glue pct 58.

After the inner margin of the patch is thus adhesively applied to thefolded valve extension 5, the bag tube passes beneath a pressure belt Stso as to insure proper setting of the adhesive.

From the pressure belt 50, the bag tube carries the sleeve patch and thevalve extension into engagement with a suitable folder 62 which returnsthe valve extension to its unfolded position, the sleeve patch beingcarried therewith as shown in Fig. 5.

The sleeve patch then rides over a suitable folder 64 which folds thepatch back over the edge of the valve extension and over the end flap 12(Fi 6).

During the continued movement of each bag tube with the valve patch thusattached, a rod 58 engages beneath the inner side flap 8 of the bag tubeand swings this side flap upwardly and downwardly toward the other sideflap. As the inner side flap is acted upon by the rod 86, a blade 58 isswung against the base of the rising side flap, sleeve patch, and endflap I2 so as to insure proper central folding of these parts, andduring the continued forward movement of the bag tube the blade 88 isretracted therefrom and out of the path of the bag tube and the rod 68.

Also, during such closing movement of the inner side flap 8, a blade Tstrikes against the outer edge of the end flap I8 below the gusset linethereof, and thus forces the gusseted portion of the flap inwardly sothat during the continued closing movement of the inner side flap 8,this end flap is restored to its initial position as a continuation ofthe gusset and side walls of the adjacent longitudinal portion of thebag tube (Fig. 13).

After such reclosing of the bag tube with the valve formed therein andthe valve patch applied, the bag tube may be discharged from the machineready for final closing in the usual manner by a line of stitchesthrough the upper margins of the bag tube and the sleeve patch.

As shown, the side flap closing rod 65 may be secured on the undersideof a supporting rod I2 having its ends secured to a pair of chains I4which pass over sprocket wheels I6 that are mounted on shafts I8 havingtheir ends journaled in hearings in the side frames 88 of the machine.The rear shaft I8 is driven so as to drive the chains I4 by means ofgears 82 which connect it with a shaft 84 that is driven by a gear 86thereon that is operatively engaged by a gear 88 which in turn is driventhrough miter gears 90 from the main drive shaft 92 of the machine(Figs. 10 and 14).

The blade 68 above described is secured on a pivot shaft 94 which has anarm 96 that is connected by a link 98 with a cam lever I88 carrying acam roll I82 which is .held in engagement with a cam I04 by means of aspring I06. The cam I84 is carried by the shaft 84 (Figs. 15 and 16) Thestriker blade I0 (Figs. 11 and 12) is carried by a pivot shaft I88 whichhas an arm III) which is operatively connected through a link I I2 witha cam lever H4 that carries a cam roll H5 held in engagement with a camI I8 by means of a spring I20. The cam I I8 is carried by the shaft 84.The conveyor chains 24 may be driven by sprocket wheels I22 carried by ashaft I24 that is driven through a gear I26 thereon from driving gear88.

As will be evident to those skilled in the art, my invention permitsvarious modifications without departing from the spirit thereof or thescope of the appended claims.

What I claim is:

1. In a machine for forming a sleeve valve bag of the class described,which comprises means for feeding gusseted bag tubes longitudinally onebehind the other, each bag tube having a valve extension on theadvancing end thereof and said end of the bag tube being spread andflattened to provide side flaps and end flaps overlying the side flaps,one of the side flaps being folded against the side of the body of thetube, a folder for causing the valve extension of each bag to be foldedback upon the adjacent end flap as the bag reaches a predetermined pointin its travel, devices for adhesively securing the inner end of a sleevepatch to the upwardly directed side of the folded valve extension aseach bag tube reaches another predetermined point in its travel, foldingmeans for returning said valve extension to its unfolded condition andfolding said patch outwardly over the inner edge of said valve extensionduring the continued travel of each bag, means for restoring said sideflaps to their initial closed position comprising a member traveling inthe same direction but at increased speed with said bag tube engagingthe underside of said folded side flap and riding over said side flap tofold it against the other side flap, and an oscillating arm for engagingthe top side of said valve extension at the base of said folded sideflap to cooperate with said member in restoring said side flaps to theirinitial closed position.

2. In a machine for forming a sleeve valve bag of the class described,which comprises means for feeding gusseted bag tubes longitudinally onebehind the other, each bag tube having a valve extension on theadvancing end thereof and said end of the bag tube being spread andflattened to provide side flaps and end flaps overlying the side flaps,one of the side flaps being folded against the side of the body of thetube, a folder for causing the valve extension of each bag to be foldedback upon the adjacent end flap as the bag reaches a predetermined pointin its travel, devices for adhesively securing the inner end of a sleevepatch to the upwardly directed side of the folded valve extension aseach bag tube reaches another predetermined point in its travel, foldingmeans for returning said valve extension to its unfolded condition andfolding said patch outwardly .over the inner edge of said valveextension during the continued travel of each bag, means for restoringsaid side flaps to their initial closed position comprising a membertraveling in the same direction but at increased, speed with said bagtube engaging the underside of said folded side flap and riding oversaid side flap to fold it against the other side flap, an oscillatingarm for engaging the top side of said valve extension at the base ofsaid folded side flap to cooperate with said member in restoring saidside flaps to their initial closed position, and means comprising an armacting automatically as said side flap is being closed to strike thegusseted portion of the other end flap to restore it to its initialposition as continuations of the longitudinal gusseted portion and sidewalls of the bag tube.

3. In a machine for forming a valve bag of the class described, meansfor feeding longitudinally a gusseted bag having a valve extension onthe advancing end thereof, said end of the bag tube being spread andflattened to provide side flaps and end flaps overlying the side flaps,

said valve extension being a continuation of one of said end flaps, oneof the side flaps being folded against the side of the body of the tube,means acting automatically during the feeding of the tube for foldingthe last-mentioned side flap upwardly and then downwardly towards theother side flap with the valve extension and its associated end flapfolded inwardly between the side flaps to form a valve, and a device forsimultaneously restoring the gusseted portion of the other end flap toits initial position as a continuation of the gusset and side walls ofthe adjacent longitudinal portion of the bag tube.

4. A structure according to claim 3 in which the device for restoringthe gusseted portion of the end flap to its initial position comprisesan oscillating arm acting automatically in timed relation to the feedingof the bag tube tostrike the base of said gusseted portion to force thelongitudinal center thereof inwardly during the closing of the sideflaps.

PAUL C. ROBINSON.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 2,044,476 Koenig June 16, 1936 2,096,788 Coty Oct. 26, 19372,325,042 Crawford July 27, 1943 2,387,274 Lee Oct. 23, 1945 2,415,862Belcher Feb. 18, 1947 2,559,873 Grupe et al July 10, 1951

